Fakhr ad-Din ar-Razi

Muhammad ibn Umar Fakhr ad-Din ar-Razi (544-606 AH / 1149-1210 CE) was one of the most brilliant and encyclopedic scholars of the medieval Islamic world, renowned for his monumental Quranic commentary and his mastery of theology, philosophy, and the natural sciences. Born in Ray (near present-day Tehran), he was the son of the Shafii preacher Diya ad-Din al-Maki and studied theology, jurisprudence, and philosophy from a young age.

Ar-Razi's masterpiece is Mafatih al-Ghayb (Keys to the Unseen), more commonly known as at-Tafsir al-Kabir (The Great Commentary), a massive Quranic commentary spanning thirty-two volumes that integrates traditional exegesis with extensive theological, philosophical, and scientific discussions. It is the most comprehensive tafsir from the Ash'ari theological perspective. While some scholars criticized it for containing too much philosophical material (a famous quip says 'it contains everything except tafsir'), it remains one of the most widely studied and cited commentaries. He also authored Asas at-Taqdis (on theology), al-Mahsul (on usul al-fiqh), al-Matalib al-Aliyah (on philosophy and theology), and numerous other works.

Ar-Razi was a prolific debater who engaged scholars of all theological and philosophical persuasions, including Mutazilites, Karramites, and followers of various philosophical traditions. He traveled widely, teaching in Ray, Khorasan, Khwarezm, and Transoxiana before settling in Herat, where he died in 606 AH (1210 CE). His intellectual legacy represents the summit of the integration of Islamic theology with Aristotelian and Avicennan philosophy within a Sunni framework.